Sample problems 2: objects and arrays

forked from scresawn's block: Sample problems: objects and arrays

forked from scresawn's block: Sample problems 2: objects and arrays

forked from Craftbd's block: Sample problems 2: objects and arrays

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <h1>Please look in the code below for 4 JavaScript practice problems.</h1>
  <p>(These problems don't include any SVG manipulation, so you will need to open the developer console in order to see the output of your code)</p>
  <script>
  // Problem 1: search array1 for those states whose location is "East"
  // using console.log(), print just the state name(s).
console.log("Question 1");
    
  array1 = [
    				{name: "Arizona",  location: "Southwest"},
           	{name: "Virginia", location: "East"},
            {name: "Florida",  location: "Southeast"}
           ];

array1.forEach(function (d){
     if (d.location == "East"){
       console.log(d.name);
     }
   }); 
    
  // Problem 2: search array1 (above) for those states whose location contains the substring "South"
  // using console.log(), print just the state name(s) for these states.
    console.log("Question 2");
    
        //string.includes(substring);
    
    array1.forEach(function (s){
     if (s.location.includes("South")){
       console.log(s.name)
     }
   })
   
  // Problem 3: using iteration and console.log(), print those items that are in
  // array2 but NOT in array3
    
    console.log("Question 3");
    
  array2 = ['a','b','c', 65, 'd'];
  array3 = ['a','c','e','f','g', 87];
    
    array2.forEach(function (i){
      if (array3.includes(i) == false){
        console.log(i)
      }
    });
  
  // Problem 4: 'states' is an array of objects. Sort the array in ascending order
  // by state name
  console.log("Question 4");
    
    
  states = [{name: "Alaska", id: "AK", population: 741894},
            {name: "Virginia", id: "VA", population: 8411808},
    				{name: "Arizona", id: "AZ", population: 6931071},
            {name: "Florida", id: "FL", population: 20984400}]
            
 /* states.sort(function(a, b){
    return d3.ascending(a.name, b.name)
  })
  
  console.log(states)
  */
  
  states.sort(function(a, b){
    if (a.name < b.name) {return -1;}
    else if (a.name == b.name) {return 0;}
		else {return 1;}
  })
   console.log(states)
   
  // Problem 5: write code that determines which state(s) have a population value that is an even number. Print out the state(s) to the console

console.log("Question 5");
  
  states.forEach(function(p){
     var z = p.population % 2;
     if (z == 0){
       console.log(p.name)
     }
    
    
  })

</script>
</body>

https://d3js.org/d3.v4.min.js